"Generally Speaking", range for a mobile CB Radio could be anywhere from 1 to 20 kilometers or more, depending on terrain, type of antennas used & other factors. The "typical" range to expect from a mobile CB, with a good antenna, is about 2 to 5 miles, & you will actually get more or less than these numbers in certian areas & terrain, & as you drive. Home Base Station CB setups, with larger roof mounted Base antennas, will usually give more range than the ground level mobile units do. Power is also a contributing factor, the more you have the further you can transmit.
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